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Weighted Average Contractual Life and Exercise Price (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2012
Number of Options |
Options vested | 3,348,935
Weighted Average Remaining Contractual Life |
Options outstanding | 4 years 9 months 18 days
Options vested | 4 years 9 months 18 days
Weighted Average Exercise Price |
Options vested | $ 1.23

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